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| piston groove; piston-ring groove; piston-ring slot; ring slot | |||
| piston ring groove; piston ring slot; ring groove | |||
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活塞 环槽 : 38 phrases in 6 subjects |
| Architecture | 1 |
| Automobiles | 25 |
| Compressors | 3 |
| Drilling | 2 |
| Shipbuilding | 1 |
| Technology | 6 |
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